855 women joined the war to fix the three-year backlog of undelivered mail. Faced with discrimination and a country devastated by war, they managed to sort more than 17 million pieces of mail ahead of time. During World War II, the US Army's only all-Black, all-women battalion takes on an impossible mission: sorting through a three-year backlog of 17 million pieces of mail that hadn't been delivered to American soldiers and finish within six months.